Study of Li{sub 1+x}(Mn{sub 4/9}Co{sub 1/9}Ni{sub 4/9}){sub 1-x}O{sub 2} cathode materials for vehicle battery applications.
- Chemical Sciences and Engineering Division
Li{sub 1+x}(Mn{sub 4/9}Co{sub 1/9}Ni{sub 4/9}){sub 1-x}O{sub 2} with two lithium content (x = 0 and 0.05) has been synthesized using coprecipitated (Mn{sub 4/9}Co{sub 1/9}Ni{sub 4/9})(OH){sub 2} and their electrochemical properties have been investigated. Compared with the x = 0 material, the lithium-rich material (x = 0.05) exhibited superior electrochemical properties. When cycled between 2.5 and 4.4 V, the Li/Li{sub 1.05}(Mn{sub 4/9}Co{sub 1/9}Ni{sub 4/9}){sub 0.95}O{sub 2} cells showed high first-cycle coulombic efficiency (93%), reversible discharge capacity of 187 mAh/g at C/12 with 99% capacity retention after 40 cycles, and excellent rate performance (86% of C/12 rate at 5 C discharge current). The Li{sub 1.05}(Mn{sub 4/9}Co{sub 1/9}Ni{sub 4/9}){sub 0.95}O{sub 2} electrode also showed a full-cell pulse power characteristics (5 C discharge pulse) comparable to Li{sub 1.05}(Mn{sub 1/3}Co{sub 1/3}Ni{sub 1/3}){sub 0.95}O{sub 2} electrode and better thermal stability at charged state (4.4 V) than charged LiNi{sub 0.8}Co{sub 0.15}Al{sub 0.05}O{sub 2} (4.2 V). Using a battery design and cost model developed in-house, calculations found battery packs with Li{sub 1.05}(Mn{sub 4/9}Co{sub 1/9}Ni{sub 4/9}){sub 0.95}O{sub 2} as the positive electrode to be of lower cost and higher energy density than those with LiNi{sub 0.8}Co{sub 0.15}Al{sub 0.05}O{sub 2} and Li{sub 1.05}(Mn{sub 1/3}Co{sub 1/3}Ni{sub 1/3}){sub 0.95}O{sub 2} electrodes. The experimental and modeling results obtained in this work suggest Li{sub 1.05}(Mn{sub 4/9}Co{sub 1/9}Ni{sub 4/9}){sub 0.95}O{sub 2} to be a promising cathode material for vehicle battery applications.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- EE
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 1019256
- Report Number(s):
- ANL/CSE/JA-70199; TRN: US201114%%726
- Journal Information:
- J. Electrochem. Soc., Vol. 158, Issue 8 ; Jun. 15, 2011
- Country of Publication:
- United States
- Language:
- ENGLISH
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